mysqli_query($connect, "SELECT * FROM user LIMIT 0,8")
mysqli_query($connect, "SELECT * FROM user LIMIT 0,8")
mysqli_query($connect, "SELECT * FROM user LIMIT 8,8")
mysqli_query($connect, "SELECT * FROM user LIMIT 16,8")
mysqli_query($connect, "SELECT * FROM user LIMIT 24,8")
...
$total_rows = 100; //Сначала получаем общее количество записей в таблице
for($i=1; $i<=ceil($total_rows/8);$i++){
mysqli_query($connect, "SELECT * FROM user LIMIT ". $i*8 .",8");
}